Photothermal-responsive single-walled carbon nanotube-based ultrathin membranes for on/off switchable separation of oil-in-water nanoemulsions

Liang Hu, Shoujian Gao, Xianguang Ding, Dong Wang, Jiang Jiang, Jian Jin, Lei Jiang

Research output: Contribution to journalArticleResearchpeer-review

169 Citations (Scopus)

Abstract

Oil-contaminated wastewater threatens our environment and health, especially that stabilized by surfactants. Conventional separation protocols become invalid for those surfactant-stabilized nanoemulsions due to their nanometer-sized droplets and extremely high stability. In this paper, photothermal-responsive ultrathin Au nanorods/poly(N-isopropylacrylamide-co-acrylamide) cohybrid single-walled carbon nanotube (SWCNT) nanoporous membranes are constructed. Such membranes are capable of separating oil-in-water nanoemulsions with a maximum flux up to 35 890 m2·h-1·bar-1 because they feature hydrophilicity, underwater oleophobicity, and nanometer pore sizes. It is remarkable that the permeation flux can be simply modulated by light illumination during the process of separation, due to the incorporation of thermal-responsive copolymers and Au nanorods. Meanwhile, it shows ultrahigh separation efficiency (>99.99%) and desired antifouling and recyclability properties. We anticipate that our ultrathin photothermal-responsive SWCNT-based membranes provide potential for the generation of point-of-use water treatment devices.

Original languageEnglish
Pages (from-to)4835-4842
Number of pages8
JournalACS Nano
Volume9
Issue number5
DOIs
Publication statusPublished - 26 May 2015
Externally publishedYes

Keywords

  • Emulsion separation
  • Light-modulated flux
  • Oil-in-water nanoemulsion
  • Photothermal responsivity
  • Ultrathin membrane

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